This is the story behind the pre-inauguration wreath laying ceremony

President-elect Donald Trump and Vice President-elect Mike Pence took part in a wreath-laying ceremony at Arlington National Cemetery Thursday afternoon.

The ceremony took just under 13 minutes, according to video of the event available at CSPAN.org. Neither the president-elect nor vice-president elect chose to speak at the event.

President-elect Donald J. Trump and Vice President-elect Mike Pence place a wreath at the Tomb of the Unknown Soldier at Arlington National Cemetery, Jan. 19, 2017, in Arlington, Va. Trump will be sworn-in as the 45th president of the United States during the Inauguration Ceremony Jan. 20, 2017, in Washington, D.C. (U.S. Army photo by Rachel Larue/Arlington National Cemetery/released)

According to a report by Bloomberg, the ceremony is one of the first of the series of events that will culminate in Trump and Pence taking their oaths of office on the West Front of the Capitol Building on Jan. 20.

A 2013 report by EverythingLubbock.com notes that President Barack Obama and Vice President Joe Biden took part in a similar ceremony on Jan. 20, a day prior to their second public inauguration, and C-SPAN.org has video of Obama and Biden taking part in a 2009 ceremony prior to taking office on Jan. 18 of that year. The ceremony honors military personnel who have “served and sacrificed” according to EverythingLubbock.com.

Gary S. Davis, second left, deputy director ceremonies and special events/chief of ceremonies, U.S. Army Military District of Washington, and Maj. Gen. Bradley A. Becker, right, Commanding General, Joint Task Force-National Capital Region and the U.S. Army Military District of Washington, brief President-elect Donald J. Trump, third from left, and Vice President-elect Mike Pence, left, prior to a wreath-laying ceremony at the Tomb of the Unknown Soldier in Arlington National Cemetery, Jan. 17, 2017, in Arlington, Va. Trump and Pence placed a wreath at the Tomb. (U.S. Army photo by Rachel Larue/Arlington National Cemetery/released)

The ceremony takes place at the Tomb of the Unknowns. According to the website of Arlington National Cemetery, the Tomb was first built to honor an unknown serviceman who fell during World War I. It was dedicated on Armistice Day, 1921 (Nov. 11, now Veterans Day).

In 1958, unknown soldiers from World War II and the Korean War were interred on May 30. On May 28, 1984, the Vietnam Unknown was interred. According to homeofheroes.com, all four Unknowns were awarded the Medal of Honor. An official Army website notes that unknown Belgian, British, French, Italian, and Rumanian soldiers from World War I were also awarded the Medal of Honor.

In 1998, the Vietnam Unknown was exhumed. DNA testing later identified him as Air Force 1st Lt. Michael Joseph Blassie. CNN reported that Blassie was returned to his family and buried at the Jefferson Barracks National Cemetery.

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